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Subjects
Class 11MathematicsPermutations and CombinationsCombinationsMedium
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How many (5)-element subsets can be formed from (A={1,2,3,4,5,6,7,8,9,10}) that contain (1)?

Answer and explanation

Correct answer: (126)

The element (1) is already chosen so the remaining (4) elements are chosen from (9). The number of ways is (\binom{9}{4}=126).

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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